linux-kernel - Re: [PATCH 02/35] UBI: Fix stale pointers in ubi->lookuptbl

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Message-ID: <54803FC0.7080305@nod.at>
Date:	Thu, 04 Dec 2014 12:04:32 +0100
From:	Richard Weinberger <richard@....at>
To:	Tanya Brokhman <tlinder@...eaurora.org>, dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/35] UBI: Fix stale pointers in ubi->lookuptbl

Tanya,

Am 04.12.2014 um 12:00 schrieb Tanya Brokhman:
> Hi Richard
> 
> On 10/29/2014 2:45 PM, Richard Weinberger wrote:
>> In some error paths the WL sub-system gives up on a PEB
>> and frees it's ubi_wl_entry struct but does not set
>> the entry in ubi->lookuptbl to NULL.
>> Fastmap can stumble over such a stale pointer as it uses
>> ubi->lookuptbl to find all PEBs.
>>
>> Fix this by setting the pointers to free'd ubi_wl_entry to NULL.
> 
> There are 2 more places:
> tree_destroy() and protection_queue_destroy() where ubi_wl_entry is released. Both functions used on power down so all should be good as is, just wanted to make sure you didn't add
> ubi->lookuptbl[e2->pnum] = NULL there on purpose.

I fear you're looking at the old patch series.
Please have a look at:
"[PATCH 3/6] UBI: Fix stale pointers in ubi->lookuptbl" sent on 30.11.2014.

Thanks,
//richard
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